All throughout my teens and twenties jogging caused abdominal pain. I could feel my intestines painfully juggling inside me quite frequently leading to diarrhea. If I jogged everyday, it seemed my body adapted the best it could so this problem would reduce. But, if I even skipped a couple of days the pain would come right back.
Occasionally this led to nearly passing out and vomiting. Understandably some companions were spooked and never asked me to work out together again.
Any exercise with enough intensity to cause me to sweat would make me itch all over.
Uphill hiking, moderate to intense, more than an hour long, would cause additional problems. I would become swollen, pale, and nauseated. At first I thought I was weak and didn’t have endurance, but the odd thing was that I wasn’t out of breath and I was entirely fine the next day when others who seemed fine on the mountain might be suffering from muscle aches and fatigue.
In the recent past, 1/4 of the time I did not feel well enough to exercise, either due to hormones and/or use of NSAIDs*. Out of the 3/4 of the time I could exercise, 1/3 of the time I suffered severe migraine immediately after and 3/3 itchiness.
All these symptoms became a thing of the past once I became aware of my allergies, which truly brought back the joy in moving my body.
* NSAIDs: NonSteroidal Anti-Inflammatory Drugs such as aspirin, ibuprofen (Advil, Motrin), naproxen (Aleve).